High-resolution photocurrent spectroscopy of the positive trion state in a single quantum dot
High-resolution photocurrent spectroscopy of the positive trion state in a single quantum dot
复制标题
单量子点中正三重子态的高分辨率光电流光谱
DOI：
10.1103/physrevb.87.155315
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发表时间：
2013-04-30
影响因子：
3.7
通讯作者：
Williams, D. A.
中科院分区：
文献类型：
--
作者：
Mar, J. D.;Baumberg, J. J.;Williams, D. A.
We demonstrate high-resolution photocurrent spectroscopy of the positive trion state (X+) in a single InAs/GaAs self-assembled quantum dot (QD). Exploiting a Coulomb-mediated renormalization of the X+ transition energy, our approach allows for a sub-mu eV resolution, which is more than four orders of magnitude higher than that in previous approaches. Furthermore, such high-resolution spectroscopy of X+ permits us to obtain precise values for the X+ permanent dipole moment and polarizability, by fitting a theoretical model to the measured transition energy as a function of electric field. Since optical initialization, manipulation, and readout of a QD spin rely on the trion state as an intermediary state, such high-resolution measurements of the X+ spectrum and its dipole moment are essential for performing high-fidelity quantum computing operations on QD spin qubits.
